This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 82 |
| 3 | 190 |
| 4 | 510 |
| 5 | 1358 |
| 6 | 3724 |
| 7 | 10304 |
| 8 | 28822 |
| 9 | 81190 |
| 10 | 230112 |
| 11 | 655364 |
| 12 | 1874160 |
| 13 | 5378128 |
| 14 | 15479098 |
| 15 | 44666150 |
| 16 | 129178822 |
| 17 | 374342918 |
| 18 | 1086721216 |
| 19 | 3159778004 |
| 20 | 9200609500 |
| 21 | 26824994540 |
| 22 | 78302400478 |
| 23 | 228812026154 |
| 24 | 669286986808 |